Framing mechanism



iii, 15, 1935. A DNA FRAMING MECHANISM Filed D80. 20, 1930 I g I Patented Oct. 15, 1935 UNITED STATES PATENT OFFICE 3 Claims.

The invention relates broadly to motion imparting and translating devices, and more particularly to an improved adjusting means adapted for employment in operating the framing mechanism of a motion picture apparatus.

This invention is described and illustrated as part and for the purposes of imparting the required movement to the framing mechanism of a motion picture projector, such, for instance, as the framing mechanism described and claimed in my application, Serial No. 31,415, filed May 19, 1925, Patent No. 1,746,385, though the present invention finds a wide field of utility for other purposes. This application is a continuation in part of my Patent No. 1,746,385 issued February 11, 1930.

The principal objects and advantages of this invention reside in the provision of an improved motion imparting mechanism characterized by the provision of means for obtaining a predetermined displacement of certain elements with a minimum displacement of certain other elements; the provision of an improved means for operating the framing mechanism of a motion picture projector; the provision of an improved means for operating the framing and shutter compensating mechanisms of a motion picture projector; the provision of an improved lever operating mechanism; the provision of an improved means of the character described, which is interchangeable with various mechanisms; and the provision of an improved means for translating or transmitting motion of predetermined extent to an element and including motion reducing means.

This invention is further characterized by the provision of means in a motion picture projection apparatus for operating the framing and shutter compensating mechanisms from the rear of the machine so that this operation may be conveniently performed by the operator; the provislon of a mechanism of the character referred to wherein the moving parts thereof are operable to a large degree in one vertical plane, thus reducing the space taken up by the framing apparatus.

The foregoing and such further objects and advantages as may appear or be pointed out as this description proceeds are attained in the structural embodiment illustrated in the accompanying drawing; in which:

The figure is a fragmentary elevational view, illustrating my invention applied to a prior art device, that is, to the frame, and oil box of a motion picture projector.

Referring now to the figure, which is in part a form of prior art structure illustrated more in detail in the parent application, the conventional frame is shown at 45 upon which the oil box Ma is rotatably mounted about a shaft I5a, the oil box andsaid shaft being rotated by this invention which includes a gear 46 mounted upon the shaft l5a and meshing with an idler pinion l'l rotatably mounted on a shaft 48 secured to a frame 45 of the machine.

Motion is imparted to the pinion 41 by the provision of a segment 49 having its teeth 58 mesh ing with said pinion, said segment 49 being fixedly mounted, by the provision of screws 5|, upon an arcuate laterally extending arm 52 integrally formed on the actuating lever 53. The actuating lever 53 is mounted at its inner end upon a fulcrum 54, and at its outer end is provided with a socket 55 for receiving an actuating handle 56 by which said lever 53 may be manipulated about its fulcrum to displace the segment 49 and thus impart rotation to the pinion 6i and gear 48. This operation serves to rotate the oil box and the parts of the Geneva gear movement contained therein for framing the picture.

The lever 53 is provided with a downwardly extending lug 51, which is pivotally connected to the lower end of the oscillatable lever 31a, pivoted at 38a and connected to a spiral pinion 2 la engaging a worm No. This mechanism operates the shutter (not shown) in unison with the framing mechanism and is fully set forth in Patent No. 1,746,385 referred to.

The lever 31a performs the operation of synchronizing the shutter and is connected at 381) to the spiral pinion 2| a, which in turn imparts a partial rotation to the worm l9a mounted on the shutter shaft.

From the foregoing, it will be observed that in the invention herein disclosed the necessary motion of the lever. 56 in order to rotate the gear box is reduced to a minimum, due to the relatively greater radius of the gear segment 49 asv compared with that of the gear 4%.

Having thus described my invention and illustrated its use, what I claim as new and desire to secure by Letters Patent is:--

1. In a framing mechanism, in combination, a supporting frame, a rotatable framing member including a gear, and mounted on said frame, means for displacing said rotatable framing member comprising a lever provided with a gear segment pivoted at one end on said frame and a pinion wheel mounted on said frame operatively connecting the gear segment of said lever with the gear of said rotatable framing member.

2. In a framing mechanism, in combination, a supporting frame, a rotatable framing member mounted on said frame, an operating lever pivoted at one end on said frame and a gear train for operatively connecting said rotatable framing member and said lever, including a gear segment carried by said operating lever and a gear carried by said rotatable framing member, the gear segment of said lever having such a relation to the gear of said rotatable framing memher that a given angular displacement of said lever will cause a relatively greater angular displacement of said rotatable framing member.

3. In a framing mechanism, in combination, a supporting frame, a rotatable framing member mounted on said frame, an operating lever pivoted at one end on said frame and a gear train for operatively connecting said rotatable framing member and said lever comprising a seg mental gear secured to a laterally extending arm of said operating lever and centered on the pivot or said operating lever, a toothed wheel secured to said rotatable framing member and centered on the axis of said rotatable framing member, and a pinion mounted on said supporting frame and permanently engaging said segmental gear and said toothed wheel, the gear ratio of said segmental gear and said toothed wheel being such that a relatively greater angular displacement of said rotatable framing member is secured by a given angular displacement of said lever.

AUGUSTO DINA. 

